boat on river profferings 2021-11-17 | This video walks through an example of boat-on-a-river questions that illustrate aspects of addition and subtraction of perpendicular vectors.The web site used in the video is found at profferings.ca/iwb/vectors/index.html
Indirectly Measuring Friction profferings 2021-08-25 | This is a demonstration of a method of indirectly measuring the friction force between the bottom of a box and the table surface, and for comparing static friction and kinetic friction.A box is being pulled across a table top using a force sensor connected to a computer, which measures the pulling force.The horizontal pulling force is gradually increased until the box begins to move, at which point it is kept moving at a fairly constant velocity. Since the motion is not changing most of the time, the friction force is equal in magnitude to the pulling force.The resulting graph can be used to discuss differences between static friction and kinetic friction.
Scientific Notation on a Calculator profferings 2021-06-28 | This video demonstrates the proper way to work with scientific notation on a calculator and briefly explains why that matters.
Unit Conversion profferings 2021-06-28 | How to do unit conversion, with two examples, one simple, one complex.
Lead(II) Nitrate and Potassium Iodide profferings 2021-04-26 | The precipitation reaction between lead(II) nitrate and potassium iodide, demonstrated without commentary. It is intended for use within a larger context.
Binary Ionic Compounds Criss-Cross Rule profferings 2021-04-21 | This video steps through 3 examples of determining the formulas for binary ionic compounds from the name - monovalent elements only.
bohr diagrams profferings 2021-03-18 | Three examples of drawing electron shell diagrams, aimed at a beginning chemistry course.
Reaction Rates from Graphs profferings 2021-01-24 | This is intended for a virtual lab exercise. The video shows the reaction between Zn and HCl, which produces hydrogen gas. The escaping gas causes the mass of the remaining materials to go down over time. By pausing the video frequently and collecting mass and time data, a graph can be drawn from which reaction rates can be determined.The reaction lasts for about 20 minutes. Most of the video is a sped-up timelapse sequence, resulting in a video just over 1minute in length.
Factors affecting reaction rate: Concentration of the reactants profferings 2021-01-24 | A brief demonstration showing 1M HCl and 6M HCl reacting with zinc..This is one of 5 videos demonstrating factors affecting reaction rate. The others demonstrate:- the nature of the reactants- catalysts- surface area- temperature
Factors affecting reaction rate: Nature of the substance profferings 2021-01-24 | A brief demonstration of how the substances involved affect the rate of a reaction. A similar reaction is conducted using three different metals, which react at different rates. The reaction is between the metal and hydrochloric acid.This is one of 5 videos demonstrating factors affecting reaction rate. The others demonstrate:- catalysts- concentration of the reactants- surface area- temperature
Factors affecting reaction rate: Surface area profferings 2021-01-24 | A brief demonstration of how surface area affects the rate of the reaction between magnesium and hydrochloric acid.This is one of 5 videos demonstrating factors affecting reaction rate. The others demonstrate:- the nature of the reactants- concentration of the reactants- catalysts- temperature
Factors affecting reaction rate: Temperature profferings 2021-01-24 | A brief demonstration of how temperature affects the rate of the reaction between sodium thiosulfate and hydrochloric acid.This is one of 5 videos demonstrating factors affecting reaction rate. The others demonstrate:- the nature of the reactants- concentration of the reactants- surface area- catalysts
Factors affecting Reaction Rate: Catalysts profferings 2021-01-24 | A brief demonstration of how the addition of a copper catalyst speeds up the reaction between zinc and hydrochloric acid.This is one of 5 videos demonstrating factors affecting reaction rate. The others demonstrate:- the nature of the reactants- concentration of the reactants- surface area- temperature
Identifying Unknown Solutions Set 4 profferings 2020-10-07 | This is Set 4 of three similar videos, labelled Set 2, Set 3 and Set 4 (There is no set 1). The point of the exercise is, given 4 solutions of ionic compounds, to identify which is which based on ion colours and solubility rules. The video only shows the observations, without explanation. It is intended either for review after students have completed the lab in class, or as a virtual lab experience for students working remotely.The 4 solutions in set 4, in no particular order, are- sodium carbonate- sodium chloride- manganese(II) sulfate- nickel(III) sulfateAs for which is which, well, figuring that out is the point of the exercise.
Identifying Unknown Solutions Set 3 profferings 2020-10-07 | This is Set 3 of three similar videos, labelled Set 2, Set 3 and Set 4 (There is no set 1). The point of the exercise is, given 4 solutions of ionic compounds, to identify which is which based on ion colours and solubility rules. The video only shows the observations, without explanation. It is intended either for review after students have completed the lab in class, or as a virtual lab experience for students working remotely.The 4 solutions in set 3, in no particular order, are- copper(II) sulfate- sodium phosphate- sodium chloride- zinc nitrateAs for which is which, well, figuring that out is the point of the exercise.
Identifying Unknown Solutions Set 2 profferings 2020-10-07 | This is Set 2 of three similar videos, labelled Set 2, Set 3 and Set 4 (There is no set 1). The point of the exercise is, given 4 solutions of ionic compounds, to identify which is which based on ion colours and solubility rules. The video only shows the observations, without explanation. It is intended either for review after students have completed the lab in class, or as a virtual lab experience for students working remotely.The 4 solutions in set 2, in no particular order, are- barium nitrate- chromium(III) sulfate- manganese(II) sulfate- zinc nitrateAs for which is which, well, figuring that out is the point of the exercise.
Dissolving NaCl profferings 2020-10-07 | This silent video was created as a student assignment. Students must demonstrate their understanding of what happens when ionic compounds dissolve by providing the narration for the video.
Precipitation Reactions profferings 2020-08-24 | This video explains what is happening at the particle level in the reaction between sodium chloride and silver nitrate solutions.
Aluminum and Copper(II) Sulfate profferings 2020-08-22 | This short video shows a simple single displacement reaction between aluminum and copper(II) sulfate (with a sodium chloride catalyst added). There is no commentary. It is intended to be used as part of a larger context.
Newtons 1st Law profferings 2020-06-11 | This video is intended as a student assignment. Students demonstrate their understanding of Newton's 1st Law by adding the narration as an audio track to this otherwise silent video. You are free to use it if you wish
Newton 2nd Law profferings 2020-05-30 | This is a brief, non-mathematical explanation of Newton's 2nd Law of Motion.
Acceleration profferings 2020-05-30 | This is a brief, non-mathematical description of what acceleration is.
Vector Addition/Subtraction by Components: Applications profferings 2020-05-23 | This video uses two simple physics problems to illustrate vector addition/subtraction by components.
Vector Addition & Subtraction by Components: The Math profferings 2020-05-23 | This video uses two examples to explain how to add and subtract vectors by adding/subtracting components.
Vector Addition Concepts profferings 2020-05-23 | This video illustrates the concept that vectors can be added by breaking them into perpendicular components, then adding the components.
Acids and Bases at a Particle Level profferings 2020-05-09 | This video introduces the idea of acids as substances that add hydrogen ions to a solution and bases as substances that add hydroxide ions to a solution, i.e. the Arrhenius model. It is a simple introduction intended for beginning chemistry topics.
Dissociation of Water profferings 2020-05-09 | This video describes the dissociation of water molecules into hydrogen and hydroxide ions. It is intended as part of a sequence introducing the Arrhenius model of acids and bases in introductory chemistry.
Dissociation of Ionic Compounds in Water profferings 2020-05-07 | A brief explanation of what happens when ionic compounds and some hydrogen compounds dissolve in water. This is intended as part of an introduction to acids and bases.
Litmus Testing profferings 2020-05-01 | This is a quick demonstration of litmus tests carried out on various household substances, as an alternative to actually doing the tests in class, leading to operational definitions of acids and bases.
Writing Formulas profferings 2020-04-16 | This video is intended as a student assignment. Students demonstrate their understanding of formula writing by adding the narration as an audio track to the otherwise silent video. You are free to use it if you wish,
Synthesis Reaction profferings 2020-04-10 | This video shows the burning of magnesium metal, a synthesis reaction where magnesium combines with oxygen gas to produce magnesium oxide.
Multivalent Formulas profferings 2020-04-02 | Examples of determining formulas for ionic compounds that include multivalent metals.
Universal Gravitation with Example Problems profferings 2020-03-19 | This video briefly explains Newton's Law of Universal Gravitation and works through four examples of typical problems involving that law.
Keplers Law: Example Problems profferings 2020-03-19 | This video briefly reviews Kepler's Laws of Planetary Motion, introduces the Astronomical Unit, and works through 3 example problems involving Kepler's Laws.
Drawing Simple Lewis Structures profferings 2019-10-01 | A look at drawing Lewis structures for simple molecules of known composition.
Understanding Lewis Structures profferings 2019-09-18 | This video just explains Lewis structures for simple molecules. It is not a lesson on how to draw Lewis structures.
Lewis atoms profferings 2019-08-27 | A short explanation of how to draw Lewis dot diagrams for single atoms.
Zinc and Hydrochloric Acid profferings 2017-08-07 | This is a 30 second clip of zinc being added to hydrochloric acid, intended as a component of a separate learning resource.
Double Displacement Reaction profferings 2016-09-05 | An example of a double displacement reaction - potassium chromate + copper sulfate.
Single Displacement Reaction profferings 2016-09-03 | An example of a single displacement chemical reaction - copper and silver nitrate.
Kinematics equations 2 profferings 2015-09-30 | Using the kinematics equations for constant acceleration. The focus in this video is on finding the quantities needed to solve a kinematics problem.
Kinematics Equations 1 profferings 2015-09-22 | An introduction to the kinematics equations for constant acceleration and setting out of kinematics problems.
Focusing a Microscope profferings 2015-09-21 | Describes the process for correctly focusing a compound microscope.
Deriving equations profferings 2015-09-21 | Deriving kinematics equations from basic mechanics formulas.
Newtons Laws of Motion profferings 2015-09-15 | This is a review of Newton's Laws with an emphasis on aspects that cause difficulty for beginning physics students.
Zinc and Hydrochloric Acid profferings 2014-07-24 | The chemical reaction between zinc and hydrochloric acid.
